1) First aid involves providing immediate care to an injured or ill person until emergency medical help arrives. It aims to preserve life, prevent worsening of conditions, and promote recovery.
2) When providing first aid, one should protect, examine, and alert in that order. Protect yourself and the victim, examine for severe bleeding, responsiveness, breathing, and circulation, then alert emergency services.
3) For an unconscious non-breathing victim, provide artificial ventilation through mouth-to-mouth or mouth-to-nose and external chest compressions at a rate of 100 per minute as part of CPR to keep blood circulating until emergency help arrives.